A-LevelBiologyInfectious diseases9700/12 · May/June 2017 · Q381 Mark
Smallpox has been eradicated, but malaria and cholera have not. Which statements correctly explain this? 1 Cholera pathogens in the intestines are not destroyed by antibiotics. 2 Plasmodium antigens change during the life cycle. 3 Smallpox antigens remain stable. 4 Vaccines only work against viruses.
A1, 2 and 3
B1, 2 and 4
C1, 3 and 4
D2, 3 and 4
✓ Correct answer
A: 1, 2 and 3
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